This is the Quick Corner Caddy TM system. It includes a 8" Black Granite natural stone shelf, mounting bracket, glue, sandpaper, wipes, and instructions. With this system you can easily mount a natural stone corner shelf in a shower that is already tiled. It is the best alternative to the aftermarket metal shower corner shelf system that will rust or corrode. Please select the quantity you want. If you want it polished on the underside select the option from the list for polished underside.